A complete Currie 9-inch third member makes it easy to update your street rod, muscle car, or truck with a new gear ratio or performance differential. All Currie built-to-order third members feature a new gear case, bearings, seals, solid pinion spacer, Daytona pinion support, with a choice of gear ratio, pinion yoke, and differential type.
All Currie 9-inch third members are assembled by our in-house experts with decades of rearend setup and assembly experience, so you can trust the finished product
Currie 9-inch Third Member Features:
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Gear Case - New Currie 9-inch nodular iron race case with 3.250 bore carrier bearings for 35-spline axles |
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Pinion Support - New billet aluminum big bearing (Daytona) pinion support |
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Master Bearing kit - Includes Timken master bearing kit with seals and solid pinion spacer |
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Labor - Fully assembled and set up in-house by skilled professionals |
Third Member Options:
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Gear Ratios - Select from a wide range of ratios. Currie uses only the highest quality Motive Gear Performance® series (Orange box) ring and pinion sets |
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Differential Options - Choice of 35-spline helical gear limited slip, automatic or selectable locking differentials or steel spool (See below for option details) |
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Pinion Yoke Options- Select from a range of yokes to match your driveshaft or horsepower level |
Differential Options Explained
Truetrac and Wavetrac - Helical gear limited-slip differentials (LSD) are the modern replacement for the classic clutch style LSDs. Under normal driving conditions, a helical gear LSD operates as a standard or open differential, allowing one wheel to spin faster or slower as necessary without the noise or harsh operation of a clutch style LSD. When a drive wheel begins to slip, the helical gears inside the differential automatically engage, transferring torque to both rear wheels to maximize traction. When the wheels regain traction, the differential resumes normal operation. Unlike a traditional clutch-type LSD, helical gear LSDs require no special oil additive or maintenance to replace worn and tired clutches, as these units have no wearable parts, require no special maintenance and maintain their torque bias for the life of the unit.
ARB Air Locker - Selectable locking differential, allows the driver to positively lock or unlock the differential on demand with the flick of a dash-mounted switch. As the name implies, an onboard air compressor (sold separately) is used to apply the locking force. Once locked, the differential behaves like a spool, driving both wheels equally. When unlocked the locker behaves like an open differential, driving only one wheel at a time – usually the wheel with the least traction. The key benefits of the ARB Air Locker are its predictable behavior and legendary strength.
Detroit Locker - Automatic locking differential, designed to lock and unlock automatically when torque is applied in either a forward or reverse direction when locked it acts like a spool driving both wheels equally. When coasting or rolling into a corner (no torque applied) the Detroit Locker unlocks and momentarily operates like an open differential permitting the wheels to rotate freely. When torque is applied, exiting the corner the unit locks and drives both wheels equally. The key benefits of the Detroit Locker are its rugged construction and superb performance. The only negative is that the automatic lock and unlock operation can create a clunking sensation that can be both felt and heard in the vehicle.
Spool – The spool is the simplest and strongest option, but it lacks differential action, as both axles are joined together by the spool's solid center. Spools are not recommended for the street, as the place high twisting loads on the axles, increase tire wear and can negatively impact handling. Spools are typically only used for drag racing applications where straight-line performance is the only concern.
